EP2786273B1 - Synchronizing updates across cluster filesystems - Google Patents

Synchronizing updates across cluster filesystems Download PDF

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Publication number
EP2786273B1
EP2786273B1 EP12784347.2A EP12784347A EP2786273B1 EP 2786273 B1 EP2786273 B1 EP 2786273B1 EP 12784347 A EP12784347 A EP 12784347A EP 2786273 B1 EP2786273 B1 EP 2786273B1
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Prior art keywords
data
source
filesystem
consistency
point
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German (de)
English (en)
French (fr)
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EP2786273A1 (en
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Karan Gupta
Manoj P. Naik
Frank B. Schmuck
Mansi A. Shah
Renu Tewari
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International Business Machines Corp
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International Business Machines Corp
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1471—Saving, restoring, recovering or retrying involving logging of persistent data for recovery
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/17—Details of further file system functions
    • G06F16/178—Techniques for file synchronisation in file systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/23—Updating
    • G06F16/2365—Ensuring data consistency and integrity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/23—Updating
    • G06F16/2379—Updates performed during online database operations; commit processing

Definitions

  • This invention relates to data synchronization across cluster filesystems. More specifically, the invention relates to tracking changes in a filesystem and replaying the changes to another filesystem using a standard protocol.
  • a remote site In a scalable and writable caching system that caches remote file data, data is fetched from a remote site and updates made at the cache site, also known as the source site, and replayed at the remote site, also known as the target site. It is known that network connectivity between the source and target sites may be subject to temporary disconnects. When a disconnection between the two sites occurs, the source site should still be available for access to data that is previously cached, and as such, the source site continues to support both data and metadata updates. At such time as connectivity between the two sites is restored, the data and metadata updates need to be synchronized to the target site.
  • This invention comprises a method, system, and computer program product for synchronization of update data and metadata from a source data site in communication with a shared pool of configurable computing resources to a target data site.
  • a method for synchronization of the update data.
  • a consistency point is created in a source filesystem on a periodic basis. Each consistency point represents filesystem data and metadata at a point-in-time, and is employed to establish a recovery point. More specifically, the periodic creation of the consistency point includes a first consistency point that is created at a first point-in-time and a second consistency point that is created at a second point-in-time. The first and second consistency points are compared to identify any differences.
  • a source filesystem object is mapped to a target filesystem object based upon a corresponding relationship between the objects.
  • the source filesystem object is mapped to the corresponding target file system object, with a hard link in the source filesystem.
  • the corresponding differences are applied to the hard link of the source object as file system operations.
  • the application of the differences identified includes replaying the file system operations in the corresponding target file system object.
  • a system is provided with tools to support synchronization of consistent data.
  • a shared pool of configurable computer resources is provided with a functional unit in communication therewith, the functional unit having tools therein to support the synchronization.
  • the tools include a data manager, a delta manager, and a data mover.
  • the data manager processes data at a source site in the shared pool and periodically creates a consistency point in a source filesystem of the source site. Each consistency point represents source filesystem data and metadata at a point-in-time to establish a recovery point. More specifically, the data manager creates a first consistency point at a first point-in-time and a second consistency point at a second point-in-time.
  • the delta manager which is in communication with the data manager, functions to compare the first consistency point with the second consistency point. More specifically, the delta manager identifies any differences between the first and second consistency points.
  • the data mover which is in communication with the delta and application managers, applies the identified differences between the first and second consistency points. More specifically, for each source file system object identified as having a difference, the data mover maps the source filesystem object to the corresponding target file system object with a hard link in the source filesystem, and applies the corresponding difference to the hard link of the source object as file system operations.
  • the application of the identified differences includes replaying said file system operations in the corresponding target file system object.
  • a computer program product which may for example be delivered as a service through a network connection.
  • the computer program product comprises a computer readable storage medium having computer readable program code embodied therewith.
  • the computer readable program code is configured to, when executed by one or more processors, make said processors perform all the steps of any of the present methods.
  • a manager may be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices, or the like.
  • the managers may also be implemented in software for processing by various types of processors.
  • An identified manager of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be organized as an object, procedure, function, or other construct. Nevertheless, the executables of an identified manager need not be physically located together, but may comprise disparate instructions stored in different locations which, when joined logically together, comprise the managers and achieve the stated purpose of the managers.
  • a manager of executable code could be a single instruction, or many instructions, and may even be distributed over several different code segments, among different applications, and across several memory devices.
  • operational data may be identified and illustrated herein within the manager, and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, as electronic signals on a system or network.
  • a cloud computing environment is service oriented with a focus on statelessness, low coupling, modularity, and semantic interoperability.
  • An infrastructure comprising a network of interconnected nodes.
  • Cloud computing node (10) is only one example of a suitable cloud computing node and is not intended to suggest any limitation as to the scope of use or functionality of embodiments of the invention described herein. Regardless, cloud computing node (10) is capable of being implemented and/or performing any of the functionality set forth hereinabove.
  • a computer system/server (12) which is operational with numerous other general purpose or special purpose computing system environments or configurations.
  • Examples of well-known computing systems, environments, and/or configurations that may be suitable for use with computer system/server (12) include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments that include any of the above systems or devices, and the like.
  • Computer system/server (12) may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system.
  • program modules may include routines, programs, objects, components, logic, data structures, and so on that perform particular tasks or implement particular abstract data types.
  • Computer system/server (12) may be practiced in distributed cloud computing environments where tasks are performed by remote processing devices that are linked through a communications network.
  • program modules may be located in both local and remote computer system storage media including memory storage devices.
  • computer system/server (12) in cloud computing node (10) is shown in the form of a general-purpose computing device.
  • the components of computer system/server (12) may include, but are not limited to, one or more processors or processing units (16), a system memory (28), and a bus (18) that couples various system components including system memory (28) to processor (16).
  • Bus (18) represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures.
  • Computer system/server (12) typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer system/server (12), and it includes both volatile and non-volatile media, removable and non-removable media.
  • System memory (28) can include computer system readable media in the form of volatile memory, such as random access memory (RAM) (30) and/or cache memory (32).
  • Computer system/server (12) may further include other removable/non-removable, volatile/non-volatile computer system storage media.
  • storage system (34) can be provided for reading from and writing to a non-removable, non-volatile magnetic media (not shown and typically called a "hard drive").
  • a magnetic disk drive for reading from and writing to a removable, non-volatile magnetic disk (e.g., a "floppy disk")
  • an optical disk drive for reading from or writing to a removable, non-volatile optical disk such as a CD-ROM, DVD-ROM or other optical media
  • each can be connected to bus (18) by one or more data media interfaces.
  • memory (28) may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
  • Program/utility (40), having a set (at least one) of program modules (42), may be stored in memory (28) by way of example, and not limitation, as well as an operating system, one or more application programs, other program modules, and program data. Each of the operating systems, one or more application programs, other program modules, and program data or some combination thereof, may include an implementation of a networking environment.
  • Program modules (42) generally carry out the functions and/or methodologies of embodiments of the invention as described herein.
  • Computer system/server (12) may also communicate with one or more external devices (14), such as a keyboard, a pointing device, a display (24), etc.; one or more devices that enable a user to interact with computer system/server (12); and/or any devices (e.g., network card, modem, etc.) that enable computer system/server (12) to communicate with one or more other computing devices. Such communication can occur via Input/Output (I/O) interfaces (22). Still yet, computer system/server (12) can communicate with one or more networks such as a local area network (LAN), a general wide area network (WAN), and/or a public network (e.g., the Internet) via network adapter (20).
  • LAN local area network
  • WAN wide area network
  • public network e.g., the Internet
  • network adapter (20) communicates with the other components of computer system/server (12) via bus (18).
  • bus (18) It should be understood that although not shown, other hardware and/or software components could be used in conjunction with computer system/server (12). Examples, include, but are not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc.
  • cloud computing environment (50) comprises one or more cloud computing nodes (10) with which local computing devices used by cloud consumers, such as, for example, personal digital assistant (PDA) or cellular telephone (54A), desktop computer (54B), laptop computer (54C), and/or automobile computer system (54N) may communicate.
  • Nodes (10) may communicate with one another. They may be grouped (not shown) physically or virtually, in one or more networks, such as Private, Community, Public, or Hybrid clouds as described hereinabove, or a combination thereof.
  • cloud computing environment (50) to offer infrastructure, platforms and/or software as services for which a cloud consumer does not need to maintain resources on a local computing device. It is understood that the types of computing devices (54A)-(54N) shown in Fig. 2 are intended to be illustrative only and that computing nodes (10) and cloud computing environment (50) can communicate with any type of computerized device over any type of network and/or network addressable connection (e.g., using a web browser).
  • Fig. 3 a set of functional abstraction layers provided by cloud computing environment (50) ( Fig. 2 ) is shown. It should be understood in advance that the components, layers, and functions shown in Fig. 3 are intended to be illustrative only and embodiments of the invention are not limited thereto. As depicted, the following layers and corresponding functions are provided: hardware and software layer (60), virtualization layer (62), management layer (64), and workload layer (66).
  • the hardware and software layer (60) includes hardware and software components.
  • Examples ofhardware components include mainframes, in one example IBM® zSeries® systems; RISC (Reduced Instruction Set Computer) architecture based servers, in one example IBM pSeries® systems; IBM xSeries® systems; IBM BladeCenter® systems; storage devices; networks and networking components.
  • Examples of software components include network application server software, in one example IBM WebSphere® application server software; and database software, in one example IBM DB2® database software.
  • IBM WebSphere® application server software IBM DB2® database software.
  • Virtualization layer (62) provides an abstraction layer from which the following examples of virtual entities may be provided: virtual servers; virtual storage; virtual networks, including virtual private networks; virtual applications and operating systems; and virtual clients.
  • management layer (64) may provide the following functions: resource provisioning, metering and pricing, user portal, service level management, and SLA planning and fulfillment.
  • Resource provisioning provides dynamic procurement of computing resources and other resources that are utilized to perform tasks within the cloud computing environment.
  • Metering and pricing provides cost tracking as resources are utilized within the cloud computing environment, and billing or invoicing for consumption of these resources. In one example, these resources may comprise application software licenses.
  • Security provides identity verification for cloud consumers and tasks, as well as protection for data and other resources.
  • User portal provides access to the cloud computing environment for consumers and system administrators.
  • Service level management provides cloud computing resource allocation and management such that required service levels are met.
  • Service Level Agreement (SLA) planning and fulfillment provides pre-arrangement for, and procurement of, cloud computing resources for which a future requirement is anticipated in accordance with an SLA.
  • SLA Service Level Agreement
  • Workloads layer (66) provides examples of functionality for which the cloud computing environment may be utilized. Examples of workloads and functions which may be provided from this layer includes, but is not limited to: mapping and navigation; software development and lifecycle management; virtual classroom education delivery; data analytics processing; operation processing; and maintenance of consistent application data to support migration within the cloud computing environment.
  • applications may migrate to any data center, also referred to herein as a data site.
  • a data center also referred to herein as a data site.
  • an application is subject to migration, including a planned migration and an unplanned migration.
  • a planned migration the application migrates to any data center, i.e. target site, in the cloud while maintaining disaster recovery support, and in an unplanned migration the application is subject to failure and recovers in any data center in the cloud while maintaining disaster recovery support. Accordingly, the difference between a planned migration and an unplanned migration is the failure and subsequent recovery of a failed application.
  • the source site is the primary location of data, and the target site provides a replica of the source data.
  • the source site operates in a read-write mode to support both read and write operations
  • the target site operates in a read-only mode and is limited to supporting read operations. Continuous synchronization of source data with the target site is provided.
  • a failure of the source site is followed by a target site being upgraded to a new source site to support both read and write operations. Such an upgrade may require applications and/or tools to be migrated to the new source site to support the functionality of the new source site.
  • a fileset is a subtree of the filesystem namespace that provides an administrative boundary for data management.
  • the granularity of replication and consistency is a file set.
  • the aspect of the defined granularity guarantees that all dependent writes across all files within a given file set are guaranteed to be ordered.
  • Fig. 4 is a flow chart (400) illustrating the aspect of placing changes to the data and metadata at the source site in a queue for communication to the target site.
  • a mapping at the source site with file identifier spaces at the source and targets sites is created (402). More specifically, the inode numbers at the source site need to be mapped to the equivalent inode numbers at the target site, and the filenames at the source site may need to be mapped to the equivalent filenames at the target site.
  • An application runs at the source site (404).
  • the application may support read and/or write operations.
  • Data generated from a write operation is stored in data storage local to the source site in which the application is processing, e.g. local storage (406).
  • the data created from the write operation is replicated from the local data storage to backup data storage at the target site while the application continues to process one or more operations (408).
  • the replication at step (408) includes both data and metadata from the write operation.
  • the replication at step (408) may be conducted synchronously or asynchronously from one or more server nodes in the source site to one or more server nodes in the target site. Regardless of the format of the replication at step (408), a data consistency point is created on both the source and target data storage. The creation of the consistency point ensures that should the application be subject to a failure, the application can recover from a consistent data set.
  • a consistency point can be achieved using several different methods known to someone skilled in the art.
  • a filesystem or storage system snapshot is taken and copy-on-write semantics are employed to save data at a certain point-in-time without delaying application requests for an extended period of time.
  • any level of consistency can be used, including, but not limited to, application, crash, filesystem, etc. Accordingly, data and metadata from one or more write operations are stored in source data storage and replicated to target data storage, with creation of one or more consistency points in both data storage locations.
  • Periodic consistency points are created and maintained at both the source and target locations, with the consistency points functioning as recovery points in the event of a site failure. More specifically, a consistency point is taken local to the source site, and once all of the data reflected in the consistency point has been transmitted to the target site, a consistency point is created at the target site. Accordingly, as changes to data and metadata take place at the source site, these changes are reflected in a consistency point local to the source site, and communicated to the target site where a target consistency point is created local to the target site.
  • Fig. 5 is a flow chart (500) illustrating a process for management of consistency points at the source site.
  • a first consistency point is created local to the source site (502).
  • a second consistency point is created local to the source site (506). It is determined if there are any differences between the first and second consistency points (508).
  • a positive response to the determination at step (508) is followed by identifying the specific differences (510). More specifically, the comparison of the consistency points at the source site includes searching both metadata as reflected in inodes, and data as reflected in directory entries that may have been created, deleted or modified.
  • an inode output file is created (512) and for any directory entries that are identified as having a difference, a directory output file is created (514).
  • the difference(s) can be queued for replay at a secondary site directly without using an intermediate file, e.g. the output file.
  • the output in either the form of a queue or file may be created in a single pass. The step of replaying the output file as a series of filesystem operations may take place concurrently or in parallel to the target site.
  • the filesystem operation(s) may be a standard and/or non-proprietary filesystem operation, such as a portable operating system interface for UNIX (POSIX) filesystem operation. Accordingly, one or more output files are created or a queue is implemented for replay of the identified metadata and data differences.
  • POSIX portable operating system interface for UNIX
  • the output files are placed in an in-memory queue local to the source site (516).
  • the source site may continue to process read and write operations, which may include further changes to data and/or metadata.
  • the process continues with a return to step (504), followed by repetition of creation of subsequent consistency points and comparison thereof.
  • the application of one or more differences between consistency points is not limited to successive consistency points. More specifically, the identified differences can be between any two consistency points. For example, the differences between two consistency points can be replayed to revert changes.
  • the target site can be at a consistency point S1 and brought forward in time to S2, or the target site can be at a consistency point S2 and moved back in time to S1.
  • the first and second consistency points are not always successive in time, the consistency points can be any two consistency points. Accordingly, consistency points are created on a periodic basis, with differences between compared consistency points identified and placed in a queue for communication to the target site.
  • a disaster recovery is employed to establish or re-establish consistency at both the data and metadata levels between the source site and the target site.
  • the transmission of data in the queue occurs asynchronously in a continuous manner. If the source site experiences a node or site failure, the target site will not receive any changes that may have been in the queue at the time of failure.
  • an algorithm is invoked to interpret and execute operations on the source site.
  • the execution operations include two aspects associated with the consistency points, one aspect pertaining to differences of metadata and a second aspect pertaining to differences of data.
  • Fig. 6 is a flow chart (600) illustrating a process for detection of a failure of communication between the source and target site, and the first aspect of management of a recovery to bring the target site up to date with the data and metadata in the source site.
  • For each inode referenced in the most recent consistency point at the source site it is determined if the inode was present in a prior consistency point at the source site (602).
  • a negative response to the determination at step (602) is an indication that the subject inode is a new inode (604).
  • the attributes of the new inode at the source site are ascertained (606), and a temporary new inode is created at the target site and mapped to the referenced new inode at the source site (608). Accordingly, for each new inode referenced in the most recent consistency point at the source node, a new inode is temporarily created at the target site.
  • a hard link of the subject inode to the mapped target inode is established (612).
  • a hard link is a directory entry that associates a name with an existing file on a filesystem.
  • a positive response to the determination at step (614) is followed by placing new data in the queue at the source site and writing the data to the target inode via the hard link (616). Details of updating the data on the target site are shown in Fig. 7 described below.
  • a negative response to the determination at step (614) is followed by determining if there is new metadata referenced in the subject consistency point and associated with the subject inode (618). If the response to the determination at step (618) is negative, the reconciliation process of the metadata concludes (620). Conversely, a positive response to the determination at step (618) is followed by updating all of the metadata attributes from the consistency point in the source site to the target site (622). Accordingly, metadata consistency is maintained and reconciled between the source and target sites following a communication failure.
  • Fig. 7 is a flow chart (700) illustrating a process for reconciling directory entries in two consistency points at the source site.
  • the source inode is mapped to the target inode (704). It is then determined if the subject directory is in the most recent consistency point (706).
  • a negative response to the determination at step (706) is an indication that the subject directory has been either removed or renamed (708).
  • a link for the subject directory is established from the source site to the target site (710). Accordingly, for each directory identified in the consistency point comparison to have been removed or renamed, a link is established between the two sites for communication of the changes from the source site to the target site.
  • a positive response to the determination at step (708) is an indication that the directory has already been established at the target site.
  • a positive response to the determination at step (706) is followed by looking up the subject directory at the mapped inode at the target site (712). It is then determined if the subject directory is present in the mapped inode (714). If the directory is not present, the directory is created at the target site and link to the subject directory at the source site (716). However, if the directory is present, it is then determined if there is a change at the file level noted in the consistency point comparison at the source site (718).
  • a negative response to the determination at step (716) is an indication that the change was at the directory level (720).
  • a positive response to the determination at step (718) shows that the change is at the data level and a link from the source to the target is established to update the appropriate target inode and directory with the changed data (720). Accordingly, data consistency between the source and target sites is maintained at the directory level.
  • All filesystem operations performed at the source site are replayed in the same order at the target site, thereby guaranteeing write order and read stability. More specifically, identified differences between the source and target site consistency points are applied from the source site as a filesystem operation.
  • a method is employed to support synchronization of data from a source site to a target site. More specifically, sequential consistency points are created, differences between the consistency points are identified, and the differences are replayed from the source site to a target site as a filesystem operation.
  • tools to support the synchronization including creation of the consistency points, ascertaining differences between sequential consistency points, and converting the ascertained differences into filesystem operations for communication to the target site are all local to the source site.
  • Fig. 8 is a block diagram (800) illustrating tools embedded in a computer system to support the synchronization of data as described above.
  • a shared pool of configurable computer resources is shown with a first data center (810) and a second data center (850).
  • the first data center (810) is referred to as a source site and the second data center (850) is referred to as a target site.
  • the invention should not be limited to this quantity of data centers in the computer system. Accordingly, two or more data centers may be employed to support data synchronization.
  • Each of the data centers in the system is provided with at least one server in communication with data storage. More specifically, the first data center (810) is provided with a server (820) having a processing unit (822), in communication with memory (824) across a bus (826), and in communication with first local storage (828), and the second data center (850) is provided with a server (860) having a processing unit (862), in communication with memory (864) across a bus (866), and in communication with third local storage (868).
  • an application (880) processes read and write operations local to the first data center (810). Read operations are supported with data in the first local storage (828). Similarly, data from write operations are written to the first local storage (828).
  • Several tools are provided to support synchronization of write data from the first data center (810) to the second data center (850). More specifically, a functional unit (830) is provided local to the first data center (810) in the shared pool and in communication with memory (824) of the server (820). The functional unit (830) manages the tools that support the data synchronization. The tools include, but are not limited to a data manager (832), a delta manager (834), and a data mover (836).
  • the data manager (832) functions to process data at the source site (810) through the use of consistency points. More specifically, the data manager (832) creates consistency points of the filesystem, i.e. source filesystem, local to the source site (810) on a periodic basis.
  • Each of the created consistency points represents filesystem data and metadata at a point-in-time and function to establish a recovery point in the event of a failure.
  • the data manager (832) creates a first consistency point at a first point-in-time and a second consistency point at a second point-in-time.
  • the first consistency point may be deleted from the source site (810). Accordingly, the data manager (832) functions to capture at least two images of the source filesystem at different points in time.
  • the consistency points need to be communicated to the second data center (850) in the event of a communication failure between the first and second data center (810) and (850).
  • the communication may be limited to the differences between the two consistency points.
  • the delta manager (834) is provided in communication with the data manager (832), with the functionality of the delta manager (834) to support identification and management of such differences. More specifically, the delta manager (834) compares the first consistency point with the second consistency point and identifies any differences between the first and second consistency points. Accordingly, the delta manager (834) functions to identify differences at both the metadata and data level between two consistency points.
  • a data mover (836) is provided in communication with the delta manager (834) to manage application of the differences between the two consistency points as identified by the delta manager (834). More specifically, the data mover (836) generates an output file containing the identified differences, places the identified differences in a queue, and replays the output file as a filesystem operation. In one embodiment, the filesystem operation is replayed from the source site (810) to the target site (850) with the operation including multiple filesystem operations in a simultaneous manner. The filesystem operation employed by the data mover (836) replays only those changes that are reflected in the exact deltas as created by the delta manager (834).
  • the data mover (836) allows two or more file updates to be coalesced and transient metadata operations, e.g. temporary files, to be ignored. Because the data mover (836) replaces filesystem operations to communicate filesystem changes, the source site (810) and the target site (850) are not limited to homogeneous filesystems. In one embodiment, the source site (810) and the target site (850) may be heterogeneous filesystems. Accordingly, the data mover (836) is responsible for communicating the identified filesystem changes from the source site (810) to a target site (850) in the form of a filesystem operation.
  • filesystem changes are identified and synchronized from a source site (810) in a shared pool of resources to a target site (850). More specifically, the synchronization is supported by the data manager (832), delta manager (834), and data mover (836).
  • the synchronization of data from the source site (810) takes place in response to a fault in communication from the source site (810) to ensure that a consistent version of data at the target site (850) is maintained and progressing. Accordingly, consistency of data is maintained at two locations in the cloud to ensure that a replica of data from the source site is available at a secondary location.
  • the tools (832) - (836) are provided in the shared pool of configurable computer resources i.e. cloud, local to the source site (810).
  • the target site does not require any additional tools for computer program code to support the synchronization functionality.
  • the data manager, delta manager, and data mover, (832), (834), and (836) respectively are shown residing in memory (824) of the server (820) local to the source data center (810).
  • the data manager, delta manager, and data mover (832), (834), and (836) respectively may reside as hardware tools external to memory (824) of server (820), or they may be implemented as a combination of hardware and software.
  • the managers (832) - (836) may be combined into a single functional item that incorporates the functionality of the separate items. As shown herein, each of the manager(s) are shown local to one data center. However, in one embodiment they may be collectively or individually distributed across the shared pool of configurable computer resources and function as a unit to manage synchronization of consistent data from the source site to the target site. Accordingly, the managers may be implemented as software tools, hardware tools, or a combination of software and hardware tools.
  • aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electromagnetic, optical, or any suitable combination thereof.
  • a computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
  • Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
  • Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
  • the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.
  • These computer program instructions may also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • Fig. 9 is a block diagram (900) showing a system for implementing an embodiment of the present invention.
  • the computer system includes one or more processors, such as a processor (902).
  • the processor (902) is connected to a communication infrastructure (904) (e.g., a communications bus, cross-over bar, or network).
  • the computer system can include a display interface (906) that forwards graphics, text, and other data from the communication infrastructure (904) (or from a frame buffer not shown) for display on a display unit (908).
  • the computer system also includes a main memory (910), preferably random access memory (RAM), and may also include a secondary memory (912).
  • main memory preferably random access memory (RAM)
  • the secondary memory (912) may include, for example, a hard disk drive (914) and/or a removable storage drive (916), representing, for example, a floppy disk drive, a magnetic tape drive, or an optical disk drive.
  • the removable storage drive (916) reads from and/or writes to a removable storage unit (918) in a manner well known to those having ordinary skill in the art.
  • Removable storage unit (918) represents, for example, a floppy disk, a compact disc, a magnetic tape, or an optical disk, etc., which is read by and written to by removable storage drive (916).
  • the removable storage unit (918) includes a computer readable medium having stored therein computer software and/or data.
  • the secondary memory (912) may include other similar means for allowing computer programs or other instructions to be loaded into the computer system.
  • Such means may include, for example, a removable storage unit (920) and an interface (922).
  • Examples of such means may include a program package and package interface (such as that found in video game devices), a removable memory chip (such as an EPROM, or PROM) and associated socket, and other removable storage units (920) and interfaces (922) which allow software and data to be transferred from the removable storage unit (920) to the computer system.
  • the computer system may also include a communications interface (924).
  • Communications interface (924) allows software and data to be transferred between the computer system and external devices. Examples of communications interface (924) may include a modem, a network interface (such as an Ethernet card), a communications port, or a PCMCIA slot and card, etc.
  • Software and data transferred via communications interface (924) are in the form of signals which may be, for example, electronic, electromagnetic, optical, or other signals capable of being received by communications interface (924). These signals are provided to communications interface (924) via a communications path (i.e., channel) (926).
  • This communications path (926) carries signals and may be implemented using wire or cable, fiber optics, a phone line, a cellular phone link, a radio frequency (RF) link, and/or other communication channels.
  • RF radio frequency
  • computer program medium “computer usable medium,” and “computer readable medium” are used to generally refer to media such as main memory (910) and secondary memory (912), removable storage drive (916), and a hard disk installed in hard disk drive (914).
  • Computer programs are stored in main memory (910) and/or secondary memory (912). Computer programs may also be received via a communication interface (924). Such computer programs, when run, enable the computer system to perform the features of the present invention as discussed herein. In particular, the computer programs, when run, enable the processor (902) to perform the features of the computer system. Accordingly, such computer programs represent controllers of the computer system.
  • each block in the flowcharts or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s).
  • the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • the enhanced cloud computing model supports flexibility with respect to application processing and disaster recovery, including, but not limited to, supporting separation of the location of the data from the application location and selection of an appropriate recovery site.

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US20130138615A1 (en) 2013-05-30
US9235594B2 (en) 2016-01-12
CA2851200C (en) 2019-09-10
WO2013080063A1 (en) 2013-06-06
CN103946844A (zh) 2014-07-23
US20160103850A1 (en) 2016-04-14
EP2786273A1 (en) 2014-10-08
JP2015504202A (ja) 2015-02-05
TWI509423B (zh) 2015-11-21
US10698866B2 (en) 2020-06-30
CA2851200A1 (en) 2013-06-06
CN103946844B (zh) 2017-11-24
TW201337588A (zh) 2013-09-16
US20130138616A1 (en) 2013-05-30

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